company tempering of glass Archives - Bear Glass Blog https://bearglassblog.com/tag/company-tempering-of-glass/ Wed, 18 Feb 2026 09:40:54 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://bearglassblog.com/wp-content/uploads/2015/08/cropped-Bear_logo1-1-75x75.png company tempering of glass Archives - Bear Glass Blog https://bearglassblog.com/tag/company-tempering-of-glass/ 32 32 Glass Tempering By Bear Glass https://bearglassblog.com/nj-tempering-by-bear-glass/ Thu, 26 Mar 2026 19:49:00 +0000 http://bearglassblog.com/?p=1088 Overview of Tempered Glass: Tempered glass is made using special heated furnaces, which heat the annealed glass to a uniform temperature of approximately 700ºC. When the glass exits the furnace, it is rapidly cooled. This rapid cooling puts the glass surface into a state of compression while the centre core remains in tension. THERMAL TEMPERING Tempering Process:Tempered glass is made by uniformly heating annealed glass to a temperature of up to 700°C and immediately cooling it. The glass first goes through the furnace, carried in by rollers, where it is heated using three modes – conduction, convection and radiation. The rollers conduct the heat, while the coils help in the radiation of heat. The convection effect is brought about by hot air blowing through the nozzles, thus circulating the heat inside the furnace and making sure that the glass is heated evenly on all sides. This super heated glass then undergoes a rapid cooling process by a uniform and simultaneous blast of air on both surfaces. After tempering, the stress pattern developed by the glass is high, and the mechanical strength of tempered glass is four to five times higher than that of annealed glass. Mechanical Strength of Tempered Glass = 4 x Mechanical strength of Annealed Glass When tempered glass is broken, all the stored energy is released at once and the glass breaks into small pieces. Characteristics of Tempered glass: Tempered glass is four to five times stronger than annealed glass of the same size and thickness against impact. Tempered glass has higher thermal strength, and it can withstand high temperature changes up to 250°C. Tempered glass is considered as safety glass. It is difficult to break and even in the event of a breakage, disintegrates into small relatively harmless globules. Tempering does not alter the basic characteristics of glass such as light transmission and solar radiant heat properties of normal glass. The glass surface after heat treatment has the same resistance to surface damage as annealed glass. Tempered glass cannot be cut or altered. One problem that can also exist with tempered glass is spontaneous breakage, where the glass can break for no apparent reason. Spontaneous breakage occurs when nickel sulphide stones increase in size due to repeated heating and cooling. Properties of Tempered Glass: Properties Tempered Glass Thermal Shock Resistance Up to 250°C Mechanical Strength Four to five times stronger thanannealed glass Tensile Strength 65 MPa Bending Strength 120-200 N/mm2 Surface Compression > 95 MPa Design Stress for Architectural Purposes 50 MPa Fragmentation Small round crystals Conducive for Processing Cannot be cut after Tempering Need for Tempered Glass:Tempering increases tensile strength, thermal shock resistance, and safety of normal glass. It also increases its heat withstanding capacity. Because of these properties, tempered glass is preferred in applications where strength, safety and thermal resistance are important considerations. Strength & Safety Considerations Four to five times stronger than annealed glass Two to three times stronger than heat strengthened glass Fragments into small, relatively harmless pieces, reducing the likelihood of injury. Heat resistance Withstands both uneven heating and high temperatures due to its superior edge strength compared to normal annealed glass. Because of its high edge strength tempered glass is used in spider and point fixed glazing. Thermal Breakage:Uneven heating due to direct sunlight makes glass expand and contract at different rates. This difference in the rates of expansion (central part of glass) and contraction (edges of glass) create stresses in glass which may lead to breakage. When temperature difference is below 32°C, the risk of thermal breakage is low, but when the difference becomes more than this, the risk increases significantly. Thermal breakage starts at the edge and is perpendicular to the glass edge. Breakage may be single or multiple depending on the built up stress. Several cracks indicate high thermal stresses across the glass pane. A fully tempered glass has significantly higher edge strength to withstand chances of thermal breakage. Application of Tempered Glass: Tempered glass is specifically designed for use in areas where there is a high risk of contact and breakage. It is not harder or softer than annealed glass but is tougher. Tempering does not make glass more porous nor is tempered glass more prone to scratches than normal glass. Tempered glass offers a wide variety of uses in industries including building, manufacturing, automotive, to name a few. There is a wide scope for the use of tempered glass in the building industry. It can be used to raise the elemental beauty of exteriors and interiors by using it on facades, showroom shelves, dividers, shower cabins, doors and the like. High resistance to thermal stress and small missile impact makes tempered glass an ideal choice for sloped glazing. The manufacturing industry uses tempered glass in ovens, refrigerators, fireplace screens, and shelves. In the motor vehicle industry, tempered glass is commonly used inside and rear windows. To know more about this glass product, contact Bear Glass now!

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Overview of Tempered Glass:

Tempered glass is made using special heated furnaces, which heat the annealed glass to a uniform temperature of approximately 700ºC. When the glass exits the furnace, it is rapidly cooled. This rapid cooling puts the glass surface into a state of compression while the centre core remains in tension.

THERMAL TEMPERING

Tempering Process:
Tempered glass is made by uniformly heating annealed glass to a temperature of up to 700°C and immediately cooling it. The glass first goes through the furnace, carried in by rollers, where it is heated using three modes – conduction, convection and radiation. The rollers conduct the heat, while the coils help in the radiation of heat. The convection effect is brought about by hot air blowing through the nozzles, thus circulating the heat inside the furnace and making sure that the glass is heated evenly on all sides. This super heated glass then undergoes a rapid cooling process by a uniform and simultaneous blast of air on both surfaces.


After tempering, the stress pattern developed by the glass is high, and the mechanical strength of tempered glass is four to five times higher than that of annealed glass.

Mechanical Strength of Tempered Glass = 4 x Mechanical strength of Annealed Glass

When tempered glass is broken, all the stored energy is released at once and the glass breaks into small pieces.

Characteristics of Tempered glass:

Tempered glass is four to five times stronger than annealed glass of the same size and thickness against impact.

Tempered glass has higher thermal strength, and it can withstand high temperature changes up to 250°C.

Tempered glass is considered as safety glass. It is difficult to break and even in the event of a breakage, disintegrates into small relatively harmless globules.

Tempering does not alter the basic characteristics of glass such as light transmission and solar radiant heat properties of normal glass.

The glass surface after heat treatment has the same resistance to surface damage as annealed glass.

Tempered glass cannot be cut or altered.

One problem that can also exist with tempered glass is spontaneous breakage, where the glass can break for no apparent reason. Spontaneous breakage occurs when nickel sulphide stones increase in size due to repeated heating and cooling.

Properties of Tempered Glass:








































PropertiesTempered Glass
Thermal Shock ResistanceUp to 250°C
Mechanical StrengthFour to five times stronger than
annealed glass
Tensile Strength65 MPa
Bending Strength120-200 N/mm2
Surface Compression> 95 MPa
Design Stress for Architectural Purposes50 MPa
FragmentationSmall round crystals
Conducive for ProcessingCannot be cut after Tempering

Need for Tempered Glass:
Tempering increases tensile strength, thermal shock resistance, and safety of normal glass. It also increases its heat withstanding capacity. Because of these properties, tempered glass is preferred in applications where strength, safety and thermal resistance are important considerations.


  • Strength & Safety Considerations

    • Four to five times stronger than annealed glass

    • Two to three times stronger than heat strengthened glass

    • Fragments into small, relatively harmless pieces, reducing the likelihood of injury.



  • Heat resistance

    • Withstands both uneven heating and high temperatures due to its superior edge strength compared to normal annealed glass. Because of its high edge strength tempered glass is used in spider and point fixed glazing.

Thermal Breakage:
Uneven heating due to direct sunlight makes glass expand and contract at different rates. This difference in the rates of expansion (central part of glass) and contraction (edges of glass) create stresses in glass which may lead to breakage. When temperature difference is below 32°C, the risk of thermal breakage is low, but when the difference becomes more than this, the risk increases significantly.

Thermal breakage starts at the edge and is perpendicular to the glass edge. Breakage may be single or multiple depending on the built up stress. Several cracks indicate high thermal stresses across the glass pane. A fully tempered glass has significantly higher edge strength to withstand chances of thermal breakage.

Application of Tempered Glass:

Tempered glass is specifically designed for use in areas where there is a high risk of contact and breakage. It is not harder or softer than annealed glass but is tougher. Tempering does not make glass more porous nor is tempered glass more prone to scratches than normal glass. Tempered glass offers a wide variety of uses in industries including building, manufacturing, automotive, to name a few.

There is a wide scope for the use of tempered glass in the building industry. It can be used to raise the elemental beauty of exteriors and interiors by using it on facades, showroom shelves, dividers, shower cabins, doors and the like.

High resistance to thermal stress and small missile impact makes tempered glass an ideal choice for sloped glazing.

The manufacturing industry uses tempered glass in ovens, refrigerators, fireplace screens, and shelves.

In the motor vehicle industry, tempered glass is commonly used inside and rear windows.

To know more about this glass product, contact Bear Glass now!

The post Glass Tempering By Bear Glass appeared first on Bear Glass Blog.

]]> BEAR GLASS WIRE GLASS https://bearglassblog.com/bear-glass-wire-glass/ Mon, 13 Jun 2011 17:58:08 +0000 http://bearglassblog.com/?p=582   Bear Glass has the answers you are looking for regarding wire glass.  Wire glass is used in fire-rated windows and doors because it meets most fire codes. It is made by feeding a welded wire net into the molten glass before it enters the rollers. The wire does not add strength to the glass, but it does hold the glass in the sash if it shatters. The process of wire glass, or wired glass, is sheet glass in which wire mesh has been inserted during production. The impact resistance of this glass is similar to that of normal glass, but in case of breakage, the mesh retains the pieces of glass. This product used to be accepted as low-cost fire glass but is no longer acceptable for this use. Now, wire glass is mostly used for windows because of it exceptional security qualities. Clear wire glass and obscure wire glass is available at Bear Glass. Wire glass is a common sight in schools, businesses, and hotels across the nation. Wire glass is manufactured primarily as a fire retardant, with wire mesh inlaid in the glass to prevent it from shattering and breaking out under stress or when exposed to high temperatures. With the window intact, the wire glass keeps the fire at bay, protecting those on the other side from the harmful effects of smoke and flame. Wire glass typically comes in two types — Misco and boxed. Misco is also called diamond wire glass. In boxed wire glass, the wire is rotated 45-degrees, so that it makes s a checkerboard pattern, rather than diamonds. There are pros and cons of installing wire glass. There are many myths about wire glass and its proper usage. Primarily, most people assume that that the incorporation of wire into the glass makes it stronger, and that this makes it a good option for security glass. Actually, the wire in the glass actually weakens the wire glass from a strength standpoint, and makes it more susceptible to breaking. What the wire does do for the glass is hold it in place. That makes it safer from the standpoint that a broken window won’t send glass fragments showering through a room (hence its use in schools), and that the wire will hold the glass in place under extreme temperatures (hence its status as fire rated glass). Wire glass is a smart addition in any area where a solid fire barrier and safety glass are beneficial. This includes using wire glass in public areas such as schools, public buildings, and businesses, and particularly in areas of these buildings that provide escape routes in case of fire. Windows in stairwells and in hallways that lead to emergency exits are prime examples of areas where fire rated wire glass is a smart addition. We ship wire glass world wide. For more information, please contact us at: FACTORY/OFFICE Address: Bear Glass Inc. 399 20th Street Brooklyn, NY 11215 Phone: 718-832-3604 Fax: 718-832-0786 Email: bearglass@yahoo.com

The post BEAR GLASS WIRE GLASS appeared first on Bear Glass Blog.

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Bear Glass has the answers you are looking for regarding wire glass.  Wire glass is used in fire-rated windows and doors because it meets most fire codes. It is made by feeding a welded wire net into the molten glass before it enters the rollers. The wire does not add strength to the glass, but it does hold the glass in the sash if it shatters.

The process of wire glass, or wired glass, is sheet glass in which wire mesh has been inserted during production. The impact resistance of this glass is similar to that of normal glass, but in case of breakage, the mesh retains the pieces of glass. This product used to be accepted as low-cost fire glass but is no longer acceptable for this use. Now, wire glass is mostly used for windows because of it exceptional security qualities. Clear wire glass and obscure wire glass is available at Bear Glass.

Wire glass is a common sight in schools, businesses, and hotels across the nation. Wire glass is manufactured primarily as a fire retardant, with wire mesh inlaid in the glass to prevent it from shattering and breaking out under stress or when exposed to high temperatures. With the window intact, the wire glass keeps the fire at bay, protecting those on the other side from the harmful effects of smoke and flame.

Wire glass typically comes in two types — Misco and boxed. Misco is also called diamond wire glass. In boxed wire glass, the wire is rotated 45-degrees, so that it makes s a checkerboard pattern, rather than diamonds.

There are pros and cons of installing wire glass.

There are many myths about wire glass and its proper usage. Primarily, most people assume that that the incorporation of wire into the glass makes it stronger, and that this makes it a good option for security glass. Actually, the wire in the glass actually weakens the wire glass from a strength standpoint, and makes it more susceptible to breaking. What the wire does do for the glass is hold it in place. That makes it safer from the standpoint that a broken window won’t send glass fragments showering through a room (hence its use in schools), and that the wire will hold the glass in place under extreme temperatures (hence its status as fire rated glass).

Wire glass is a smart addition in any area where a solid fire barrier and safety glass are beneficial. This includes using wire glass in public areas such as schools, public buildings, and businesses, and particularly in areas of these buildings that provide escape routes in case of fire. Windows in stairwells and in hallways that lead to emergency exits are prime examples of areas where fire rated wire glass is a smart addition.

We ship wire glass world wide.

For more information, please contact us at:

FACTORY/OFFICE

Address:

Bear Glass Inc.

399 20th Street

Brooklyn, NY 11215

Phone: 718-832-3604

Fax: 718-832-0786

Email: bearglass@yahoo.com

The post BEAR GLASS WIRE GLASS appeared first on Bear Glass Blog.

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